Measurements of the principal parts connected with the auditory organs
Internal auditory meatus:
Length of anterior wall, 13-14 mm.
Length of posterior wall, 6.7 mm.
External auditory meatus . . 14-16 mm. (Gruber.)
Length, 13 mm.
Height in center of cavity, 15 mm.
Width opposite the membrana tympani, 2 mm.
Width opposite the tubal orifice, 3-4 mm.
Superior semicircular canal measures along its convexity 20 mm.
The posterior semicircular canal measures along its convexity 22 mm.
The external semicircular canal measures along its convexity 15 mm.
The canal is in diameter 1.5 mm. (Buschke.)
The ampulla of the canal 2.5 mm.